Now before I get into the plot spoilers just a fair and good warning, the MC ISN'T a possessor or reincarnator ect, he is actually Godzilla just given an actual voice an consciousness so there's none of this human emotions BS like in most Chinese novels. Also the author is very "educated" on scientific terminology like materials and methods of nuclear fusion and fission, from what I can tell as they could just be spouting a bunch of nonsense trying to make Godzillas chemical and physical makeup sound cool.

Godzilla, for anyone who doesn't know, is a Titan (an old ass monster that has lived since the beginning of the earth, honestly go watch any movie and you'll understand) and he has been in a slumber for the past 200 years since 2000 ish. He wakes up from his very short slumber and finds the ocean oddly quiet. Sorry to say but humans killed everything off in a nuclear war and pretty much every organism is dead, including all of his Titan friends (more on this later). He wakes up with a system message notifying him of his objective, erase all humans in the universe and you'll be rewarded.

The story takes on many perspectives so far but they can be categorised into two main ones, Godzilla and humans. Both are very fleshed out and actually provide good story points that don't make the other too useless, the author does a great job at providing a human nature to Godzilla that fits him into a good MC roll without making him humanised, as in no emotions but he has thoughts and a voice so to say. The humans are mainly military officers or government officials and all play a certain part in the story, not just being used once and never seen again.

This is all I'll mention for now since I could just give an entire overview and ruin the whole story for all of you, but that's no fun!

In the later chapters released so far (45-55) we get some specks of future events and characters from tha author that I believe are significant. When reminiscing about his Titan brothers, Godzilla gets a flash of King Ghidorah, who should've been killed by humans during Godzillas dormancy and is reinforced by no Titans on earth responding to his communication, along with the image of Venus popping up in his mind. In chapter 54 another human character mentions this:

As I write down this record, I have a premonition. I feel that perhaps in the near future, the era belonging to humans will come to a complete end, and the era belonging to monsters will dawn.

A foolish premonition, truly. There's only Godzilla left among the Titans. How could there possibly be an era of monsters? Other than Godzilla, there are no other Titans left on Earth.

Could they fly over from other planets?

Weird huh? This just happens to match up with what Godzilla was told through his memories. So I assume this will turn into a battle between Monsters that have either reincarnated or evolved much like Godzilla but we'll have to see.